Photographic printing-frame



(No Model.)

J. A. TODD. Photographic Printing Frame.

No. 230,159. Patented July 20,1880.

UNITED STATES PATENT OFFICE.

JOHN A. TODD, OF SACRAMENTO, CALIFORNIA.

PHOTOGRAPHIC PRINTING-FRAME.

SPECIFICATION forming part of Letters Patent No. 230,159, dated July 20, 1880. Application filed March 29, 1880. (No model.)

To all whom it may concern:

Be it known that I, J OHN A. TODD, of the city of Sacramento, State of California, have invented a new and useful Improvement in a Photographic Printing-Frame, of which the following is a specification.

The invention relates particularly to printing vignettes or that class of photographs in Which the outer margins are blended or without distinct lines.

The nature of the invention consists in using a flexible diaphragm that can be adjusted to various curves and angles, so as to difluse the rays of the light that would otherwise form the lines of the pictures that are to be blended.

In the accompanying drawings, in which like letters refer to like parts, Figure 1 is a sectional view of an apparatus embodying my invention.

Arepresents an opening through the board B, through which the light passes in the operation of printing from the negative-plate N upon the paper P, the paper P and negative N resting upon the board B, that represents the back of an ordinary printing-frame.

The diaphragm O, which is the principal feature of my invention, is composed of any thin flexible material, and constructed as shown, or in any other required form, such, for instance, as shown in dotted lines. Through the diaphragm O is an opening, shown by dotted lines. Through this opening the light passes that falls on the negative N. The diaphragm 0, being formed at an angle or curved on a plane differing from that of the negative N, 5 causes the diffusion of the light more or less around the-margin of the picture, said margin being limited by the opening through the diaphragm 0, according to the varying angles at which the diaphragm may be bent.

Fig. 2 is a section of a frame, F, coped with the board R, provided with opening A, ow'er which a tissue-paper or semi-transparent substance is placed. The frame F is provided with a series of slats at two ends or sides of the frame. Between these slats the ends of the diaphragm G are inserted. A number of these slats are used to allow the ends of O to be inserted; or, in place of these slats, wires, grooves, or any equivalent device may be used that will suffice to hold the ends of O, as shown.

Fig. 3 is aperspective view of the diaphragm G, in which L is the opening. 0 is a bend or angle, made for ease of adjustment when in place, the end 0 being the continuation past the angle 0.

What I claim as my invention is- In a photographic printing-frame, F, provided with slats S S, the adjustable curved diaphragm G 0, provided with aperture L, and offset 0, substantially as described, and for the purposes set forth.

JOHN A. TODD.

lVitnesses:

CLARENCE L. HEALY, WILLIAM S. JOHNSTON. 

